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Simplifying 2(4x + -6) + -9 = 8x + -21 Reorder the terms: 2(-6 + 4x) + -9 = 8x + -21 (-6 * 2 + 4x * 2) + -9 = 8x + -21 (-12 + 8x) + -9 = 8x + -21 Reorder the terms: -12 + -9 + 8x = 8x + -21 Combine like terms: -12 + -9 = -21 -21 + 8x = 8x + -21 Reorder the terms: -21 + 8x = -21 + 8x Add '21' to each side of the equation. -21 + 21 + 8x = -21 + 21 + 8x Combine like terms: -21 + 21 = 0 0 + 8x = -21 + 21 + 8x 8x = -21 + 21 + 8x Combine like terms: -21 + 21 = 0 8x = 0 + 8x 8x = 8x Add '-8x' to each side of the equation. 8x + -8x = 8x + -8x Combine like terms: 8x + -8x = 0 0 = 8x + -8x Combine like terms: 8x + -8x = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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